Leaf

I would try more nitrogen. A decent amount of nitrogen is still needed during the first 2-4 weeks of flower. There is a whole lot of new plant being generated during stretch and nothing feeds new growth like nitrogen.

I've had the same issue on a few plants now seems like most people don't have a clue lol looks like p or k deficiency, can also be several other issues but based on the fact that your Plat seems to bee lightening up I want to say you probably should just try going a bit heavier on the feedings, what nutes are you using and remember it is actually a bit normal around the 5th week and on of flower for her to start using those leaves for bud growth

thanks everyone for the reply